On Thu, Nov 26, 2020 at 05:48:33PM +0800, Jeffle Xu wrote:

The inflight of partition 0 doesn't include inflight IOs to all
sub-partitions, since currently mq calculates inflight of specific
partition by simply camparing the value of the partition pointer.

Thus the following case is possible:

$ cat /sys/block/vda/inflight
?? ?? ?? ??0 ?? ?? ?? ??0
$ cat /sys/block/vda/vda1/inflight
?? ?? ?? ??0 ?? ?? ??128

Partition 0 should be specially handled since it represents the whole
disk.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

But can you resend with your information on the old kernels, and maybe
even with a Fixes tag?